calc 2.14.0.2 release

The following are the changes in this release:

The clean and clobber makefile rules no longer list custom/Makefile
as a dependency.

Unfortunately due to the complex dependency issues between
Makefile, Makefile.ship and custom/Makefile, parallel GNU make
is NOT recommended.  Sorry (tm Canada) :)

Fixed a few typos in CHANGES.

As a side note: We stayed v2.13.x was kept for only a short time.
The move to 2.14.x was motivated by non-compatible changes due to
the default order of CALCRC, plus some new builtin functions.

More changes are likely, so we might see another v2.14.0.x release
before things are declared "recommended stable".

Not that we wan to discourage people from trying v2.14.0, you should
try it.  We just want things to become stable and well field tested
before we reach the "recommended stable" release state.