Add Max Concurrent Connections setting to mail config dialog

Removed the yield line interval (this is a questionable setting anyway).

Also, made the unlimited max-connections display as "N/A" (instead of
"0") in the Terminal Server config dialog.

src/sbbs3/ctrl/MailCfgDlgUnit.cpp

@@ -95,10 +95,10 @@ void __fastcall TMailCfgDlg::FormShow(TObject *Sender)
         MaxMsgsWaitingEdit->Text="N/A";
     else
         MaxMsgsWaitingEdit->Text=AnsiString(MainForm->mail_startup.max_msgs_waiting);
-    if(MainForm->mail_startup.lines_per_yield == 0)
-        LinesPerYieldEdit->Text="N/A";
+    if(MainForm->mail_startup.max_concurrent_connections == 0)
+        MaxConConEdit->Text="N/A";
     else
-        LinesPerYieldEdit->Text=AnsiString(MainForm->mail_startup.lines_per_yield);
+        MaxConConEdit->Text=AnsiString((int)MainForm->mail_startup.max_concurrent_connections);
 
     AutoStartCheckBox->Checked=MainForm->MailAutoStart;
     LogFileCheckBox->Checked=MainForm->MailLogFile;
@@ -234,7 +234,7 @@ void __fastcall TMailCfgDlg::OKBtnClick(TObject *Sender)
     MainForm->mail_startup.max_msgs_waiting=MaxMsgsWaitingEdit->Text.ToIntDef(0);
     MainForm->mail_startup.max_delivery_attempts=DeliveryAttemptsEdit->Text.ToIntDef(MAIL_DEFAULT_MAX_DELIVERY_ATTEMPTS);
     MainForm->mail_startup.rescan_frequency=RescanFreqEdit->Text.ToIntDef(MAIL_DEFAULT_RESCAN_FREQUENCY);
-    MainForm->mail_startup.lines_per_yield=LinesPerYieldEdit->Text.ToIntDef(0);
+    MainForm->mail_startup.max_concurrent_connections=MaxConConEdit->Text.ToIntDef(0);
 
     SAFECOPY(MainForm->mail_startup.default_charset
         ,DefCharsetEdit->Text.c_str());

src/sbbs3/ctrl/MailCfgDlgUnit.dfm

 object MailCfgDlg: TMailCfgDlg
-  Left = 1213
-  Top = 393
+  Left = 1274
+  Top = 822
   BorderStyle = bsDialog
   Caption = 'Mail Server Configuration'
   ClientHeight = 246
@@ -53,8 +53,8 @@ object MailCfgDlg: TMailCfgDlg
     Top = 3
     Width = 278
     Height = 199
-    ActivePage = POP3TabSheet
-    TabIndex = 2
+    ActivePage = GeneralTabSheet
+    TabIndex = 0
     TabOrder = 3
     object GeneralTabSheet: TTabSheet
       Caption = 'General'
@@ -84,13 +84,13 @@ object MailCfgDlg: TMailCfgDlg
         AutoSize = False
         Caption = 'Max Inactivity'
       end
-      object LinesPerYieldLabel: TLabel
+      object MaxConConLabel: TLabel
         Left = 7
         Top = 140
         Width = 85
         Height = 19
         AutoSize = False
-        Caption = 'Lines Per Yield'
+        Caption = 'Max Con-Conn'
       end
       object MaxMsgsLabel: TLabel
         Left = 7
@@ -178,14 +178,12 @@ object MailCfgDlg: TMailCfgDlg
         ShowHint = True
         TabOrder = 10
       end
-      object LinesPerYieldEdit: TEdit
+      object MaxConConEdit: TEdit
         Left = 92
         Top = 140
         Width = 39
         Height = 21
-        Hint = 
-          'Number of lines of message text sent/received between time-slice' +
-          ' yields'
+        Hint = 'Maximum Concurrent Connections from same IP (0=unlimited)'
         ParentShowHint = False
         ShowHint = True
         TabOrder = 6

src/sbbs3/ctrl/MailCfgDlgUnit.h

@@ -112,8 +112,8 @@ __published:
 	TEdit *BLHeaderEdit;
 	TLabel *BLSubjectLabel;
 	TLabel *BLHeaderLabel;
-	TEdit *LinesPerYieldEdit;
-	TLabel *LinesPerYieldLabel;
+    TEdit *MaxConConEdit;
+    TLabel *MaxConConLabel;
 	TLabel *MaxRecipientsLabel;
 	TEdit *MaxRecipientsEdit;
 	TButton *DNSBLExemptionsButton;

src/sbbs3/ctrl/TelnetCfgDlgUnit.cpp

@@ -83,6 +83,9 @@ void __fastcall TTelnetCfgDlg::FormShow(TObject *Sender)
 
 	FirstNodeEdit->Text=AnsiString((int)MainForm->bbs_startup.first_node);
 	LastNodeEdit->Text=AnsiString((int)MainForm->bbs_startup.last_node);
+    if(MainForm->bbs_startup.max_concurrent_connections == 0)
+        MaxConConEdit->Text="N/A";
+    else
         MaxConConEdit->Text=AnsiString((int)MainForm->bbs_startup.max_concurrent_connections);
     AutoStartCheckBox->Checked=MainForm->SysAutoStart;
     AnswerSoundEdit->Text=AnsiString(MainForm->bbs_startup.answer_sound);