add new aversin and acoversin builtin functions.

Added new aversin(x, [,eps]) for inverse versed sine and acoversin(x, [,eps])
for inverse coversed sine.

Improved trig function help files to reference use of complex arguments
that while supported were not documented.

Removed old Makefile testing rules for make dbx and make gdb.

Improved "make run" to execute calccalc using shared libraries
from the local directory, and with reading of the startup scripts
disabled.

Changed "make prep" to perform various tests that are used to
help verify that calc is ready for a release.

Added Makefile testing rule testfuncsort to check for the sort
of the builtin function list.  Changed the order that builtin
functions are listed by "show builtin" and the help/builtin to
match the sorting of "LANG=C LC_ALL=C sort -d -u".

help/cot

@@ -26,8 +26,11 @@ LINK LIBRARY
     COMPLEX *c_acot(COMPLEX *c, NUMBER *eps);
 
 SEE ALSO
-    sin, cos, tan, sec, csc, epsilon
+    sin, cos, tan, sec, csc
+    asin, acos, atan, acot, asec, acsc
     versin, coversin
+    aversin. acoversin
+    epsilon
 
 ## Copyright (C) 1999,2021,2023  Landon Curt Noll
 ##