Add F-keys above 4.

Make the F-key bindings match SyncTERM.

install/termcap

@@ -23,4 +23,4 @@ ansi-bbs:\
 	:ku=\E[A:kd=\E[B:kr=\E[C:kl=\E[D:\
 	:kb=^H:kD=\177:kH=\E[Y:kN=\E[U:kP=\E[V:\
 	:kh=\E[H:@7=\E[K:\
-	:k1=\EOP:k2=\EOQ:k3=\EOw:k4=\EOx:
+	:k1=\EOP:k2=\EOQ:k3=\EOR:k4=\EOS:k5=\EOt:k6=\E[17~:k7=\E[18~:k8=\E[19~:k9=\E[20~:k;=\E[21~:F1=\E[23~:F2=\E[24~:

install/terminfo

@@ -20,7 +20,9 @@ ansi-bbs,
 	cuu=\E[%p1%dA, cuu1=\E[A, ed=\E[J, el=\E[K, el1=\E[1K, 
 	home=\E[H, ht=^I, ind=^J, invis=\E[8m, kbs=^H, kcub1=\E[D, 
 	kcud1=\E[B, kcuf1=\E[C, kcuu1=\E[A, kdch1=\177, kend=\E[K, 
-	kf1=\EOP, kf2=\EOQ, kf3=\EOw, kf4=\EOx, khome=\E[H, kll=\E[Y, 
-	knp=\E[U, kpp=\E[V, nel=^M^J, op=\E[m, rc=\E[u, rev=\E[7m, 
+	kf1=\EOP, kf10=\E[21~, kf11=\E[23~, kf12=\E[24~, kf2=\EOQ, 
+	kf3=\EOR, kf4=\EOS, kf5=\EOt, kf6=\E[17~, kf7=\E[18~, 
+	kf8=\E[19~, kf9=\E[20~, khome=\E[H, kll=\E[Y, knp=\E[U, 
+	kpp=\E[V, nel=^M^J, op=\E[m, rc=\E[u, rev=\E[7m, 
 	rs1=\E[m\E[2J\E[H, sc=\E[s, setab=\E[4%p1%dm, 
 	setaf=\E[3%p1%dm, sgr0=\E[m, smul=\E[4m,