calc 2.14.0.0 release

The following are the changes in this release:

The :-separated default CALCRC value has been reversed.
The default CALCRC was:

${CALC_SHAREDIR}/startup:~/.calcrc:./.calcinit

The default CALCRC is now:

./.calcinit:~/.calcrc:${CALC_SHAREDIR}/startup

See "help environment" for details.

Added engineering mode as per a GitHub pull request from
<GitHub user heitzmann>.  Thank you!  For example:

; config("mode","eng"),
; 10^41
	100e39

or for example:

; base(1000),
; 2^23209-1
	~402.87411577898877818187e6984

For more information see:

help base

Added regression test code for engineering mode.  Improved and
expanded regression test code related to the base() and base2()
builtin functions.

Fixed a critical bug in the above mentioned pull request where
a call to base2(1000) would make calc unstable and likely to
dump core.