Feature bash completion

This change adds on-the-fly definition of bash completions for (FOAM_APPBIN) OpenFOAM applications. This makes it easier and less error-prone than recreating the bash_completions via a script and reduces the environment overhead compared to using separate functions for each application. It also makes it relatively easy to provide as a backport for previous OpenFOAM versions.

Tcsh users now get completion as well, but for efficiency the completion_cache should be pre-built (via the bin/tools/foamCreateCompletionCache script).

changed target branch from master to develop

added 2 commits

• 3c1ed3b4 - 1 commit from branch develop
• 648fb19e - ENH: use bash associative array for completion information

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added 4 commits

• 648fb19e...c3de8731 - 3 commits from branch develop
• 46099d77 - ENH: use bash associative array for on-the-fly completion (issue #551 (closed))

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unmarked as a Work In Progress

added enhancement label

changed milestone to %v1712

changed the description

mentioned in commit 4233d482

merged