For ECL, do not compile regular expression functions

Since Maxima might be installed without a working C compiler (which is
required for ECL to be able to compile Lisp code), do not compile
some regular expression functions. For other Lisps, compile regex
functions (as it was before).
Merge branch 'master' of ssh://git.code.sf.net/p/maxima/code
implicit_plot: make sure that gnuplot-process is called correctly when ploting to a file.
Avoid index out of range in continuous_freq

Avoid index out of range in function continuous_freq in share
package descriptive. Fixes bug reported to mailing list 2014-11-26:
"Error in histogram and continuous_freq"
Merge branch 'master' of ssh://git.code.sf.net/p/maxima/code
Add tests for contrib/format
In package noninteractive, update redefinition of ENSURE-SIGN.
In package noninteractive, handle recently-added function $ASKEQUAL.
In package noninteractive, a couple of additional test cases.
Add contrib/format/rtest_format.mac to list of share files.
Fix version number parsing for Lisp-based building

Commit 752826aa changed where the version number resides in configure.in
(now configure.ac), but configure.lisp wasn't updated to use the new
location.

This caused "AM_INIT_AUTOMAKE([-Wno-portability]" to appear in place of
Maxima's version.  For instance, Maxima's banner printed as

  Maxima AM_INIT_AUTOMAKE([-Wno-portability] http://maxima.sourceforge.net

This also caused a syntax error in src/maxima:

  if [ -z "$MAXIMA_VERSION" ]; then
      MAXIMA_VERSION=AM_INIT_AUTOMAKE([-Wno-portability]
  fi
Put quotes around @VERSION@ to prevent some possible syntax errors

See commit ab898086
Replace bare @host@ with "unknown" during Lisp-based build

This host-type information is presented to users when using build_info()
and bug_report().
Warn during Lisp-based builds if we have trouble grabbing version info

Also note in configure.ac that during Lisp-based builds the AC_INIT line
is read for the version number in a whitespace-sensitive way.

See also commit ab898086
Update instructions in README.rpms for changing Maxima's version number
* Add option interpolate_color
* Allow view=map
* Update EN & ES documentation
fix wrong array element-type
last commit wasn't complete
Merge branch 'master' of ssh://git.code.sf.net/p/maxima/code
Update src/sharefiles.mk