Remove regex mode

[ghost]

Basically a revert

I started from aabec06 and cherry-picked. The result applies to 9c58d5f (which is, as of this moment, current apacman master).

List of cherry picking:

0001-Feature-69-added-testing-hooks-and-WIP-unit-test-wit.patch
0002-Minor-fixes-for-testing-hooks.patch
0003-Fix-52-install-cached-packages-without-Internet-conn.patch
0004-Fix-9-check-umask.patch
0005-Fix-51-install-groups.-Add-more-exit-codes.patch
0006-Fix-70-parse-config-flag-early.-Update-help-and-verb.patch
0007-Ver-3.0-Fix-71-flag-parameter-syntax.-Add-savedir-fl.patch
0008-Improved-exit-codes-see-man-page-and-fix-72.patch
0009-Fixes-for-gendb-testing-exit-code-8.-Update-unit-tes.patch
0010-Fix-75-clean-build-dir.-Also-check-tmpfs-free-space-.patch
0011-Misc.-fixes-and-temp-file-cleanup.patch
0012-Minor-function-cleanup.patch
0013-Use-the-same-behavior-of-pacman-s-progress-bar.patch
0014-Expand-G-to-fetch-old-AUR-versions-pkgname-ver-or-pk.patch
0015-Syntax-changes-from-master-to-make-the-patch-smaller.patch

Closes #79 because it removes regex mode entirely
Closes #80 and #88 because the issue results from calling pickone from selectprovider from existsinaur code which gives bad arguments and is being removed

[ghost]

Deleting my fork; here, have this.

0001-Remove-regex-mode.patch.txt