Fix #1227

Installed devinclude headers have conditional code depending on options
detected at configure time. This header is needed in the prefix to match
those ones to the installed libraries.

This reverts commit c6eb135c.

This reverts commit 0f0effc8.

Fixing commit: ac932817

When configure checks are finished, a summary is printed to inform
the user which features have been enabled or not, depending on
configuration flags, check results, etc.
If a feature was not present, it was not specified whether the
feature was present or not (just empty text).
Therefore, we added 'disabled' and 'enabled' words when a feature
such as allocator, memtracker, etc. is present.

They are already performed in file m4/ax_check_memkind.m4

Adding task callback experimental mechanism; enabled through configure option --enable-task-callback; closes #1156

support to be compiled.
Corrected AC_SUBST variable name for NANOX_BUILD_VERSION, used to generate
VERSION file in make dist.
Several bugfixes in m4 macros.

Fixed src/common file inclusion in configure.a

Fix extrae version command expansion.

Using core-generator in those tests that were using these two previously.
Various fixes for some tests when CC=icc

Fixed various problems in *.m4 files.
Organized a bit further configure.ac file.
Added common.in to .gitignore and deleted an unexistent file entry.

Improved macro shell-compatibility.

Fixed several errors and corrected automake conditional variable names.

Improved IBM BG/Q check.