Log Message:
nickle: update to 2.93.

Version 2.93
natural: Fix bug in optimized multiply by one
float: optimize addition of zero
Adjust printf output precision to show full resolution
Use standard C flexible array syntax for natural digits
lex.l: Don't use <history.h> with libedit
Clean up --with-libedit help string
Ignore a couple more build artifacts
test: Test hex float in scanf
Add hex float support to scanf
debian: Update standards version to 4.6.2
Add %a support to printf
Actually use HAVE_RL_CATCH_SIGNALS
test: Add math-tables.c to EXTRA_DIST