(cherry picked from commit 7d3a491d)

With this patch dunecontrol will work even if the path to the module
contains spaces. Unfortunately, the tests for dune modules will still
not work as I could not figure out how to use quoting in the CPP_FLAGS.
(cherry picked from commit eaedbeea)

not available in older bash versions.

[[Imported from SVN: r7462]]

less interference.

[[Imported from SVN: r7456]]

fix incompatibility with mawk

- explicitly state list of whitespaces
- patch by Ansgar Burchardt

[[Imported from SVN: r7452]]

translating options for provided for configure to CMake syntax.

[[Imported from SVN: r7448]]

Fixes flyspray 1260.
PLEASE REVIEW!


[[Imported from SVN: r7387]]

[[Imported from SVN: r6892]]

[[Imported from SVN: r6890]]

improve error message for invalid module names

[[Imported from SVN: r6881]]

[[Imported from SVN: r6873]]

[[Imported from SVN: r6872]]

actually depmode and mainmode where the same... only compute one of them

[[Imported from SVN: r6859]]

only update the module mode if it not DEPS, which is the

[[Imported from SVN: r6858]]

documentation for _search_module

[[Imported from SVN: r6857]]

cleaner eval/test statements

[[Imported from SVN: r6856]]

just search any module (dependencies and suggestions)
and do the splitting of DEPS and SUGS list afterwards
=> make sure a module is not listed twice

[[Imported from SVN: r6855]]

don't stop the dependency tracking if suggestion is missing,
just skip this single entry

[[Imported from SVN: r6851]]

tell the user that we skip a suggestion

[[Imported from SVN: r6850]]

add support to run the dependencies in revers order
(necessarry for "make distclean")

[[Imported from SVN: r6849]]

refactored _check_deps handled missing SUGS as fatal error.
now we just ignore SUSG which are not present or don't match the
required version

[[Imported from SVN: r6848]]

sorting modules:
distinguish between the MAIN pass and DEPS/SUGS

[[Imported from SVN: r6847]]

put path into double-ticks to allow spaces etc.

[[Imported from SVN: r6844]]

fix broken assignment after changing the naming of SORT_*_DONE_*

[[Imported from SVN: r6843]]

fix reset of SORT_*_DONE_* flags after changing the naming scheme

[[Imported from SVN: r6842]]

replay FOUNDMODULES when calling find_modules_in_path a second time

[[Imported from SVN: r6841]]

export module name to make --current work properly again

[[Imported from SVN: r6839]]

avoid parsing suggestions twice

[[Imported from SVN: r6836]]

fix DEPS and SUGS check invocation

[[Imported from SVN: r6834]]

for some straneg reason the variable module can not be local...

[[Imported from SVN: r6833]]

- factor out check and version check of dependencies
- reuse for suggestions
- make versioned suggestions work

[[Imported from SVN: r6831]]

use bash string substitution instead of sed

[[Imported from SVN: r6830]]

alternative implementation for fix_variable_name,
avoiding invocation of tr

[[Imported from SVN: r6829]]

avoid ${var} expression, $var is slightly faster

[[Imported from SVN: r6828]]

fix whitespace match for awk

[[Imported from SVN: r6827]]

fix tracking of already parsed modules
... results in a significantly speedup

[[Imported from SVN: r6826]]

bug fix and further cleanup in dunemodules.lib

[[Imported from SVN: r6825]]

- fix check_module_name
- make it faster by using a pure bash-pattern-matching

[[Imported from SVN: r6824]]

* smaller cleanups
* remove unsused methods

[[Imported from SVN: r6823]]