Converted all ASCII tabs to ASCII spaces using a 8 character
tab stop, for all files, except for all Makefiles (plus rpm.mk).
The `git diff -w` reports no changes.
In cal/palindrome.cal:
Improved the performace of nextpal() and nextprimepal()
by adding and using palnextpal().
Improved the performace of prevpal() and prevprimepal()
by adding and using palprevpal().
Test showed that runs that took 0.0530 cpu seconds can
now be done in as little as 0.0327 cpu seconds.
