In Oracle Solaris, its default grep doesn't have -F option, only xpg4
has it, so a new PATH has to be added because somehow Oracle doesn't
include them into the default PATH.

General: Fixes

Term: Rewrite Konsole font detection, closes #576

Ascii: Fix hang caused by missing OS ascii art.

ASCII: Fix SUSE logo not displayed

 Fix WM Theme detection for KDE5, closes #586

DE: Fix WM Theme not detected on MATE

General: Fix arithmetic expression

Ascii: Simplify file handling.

Install Date: Rewrite function

This reverts commit af97d1a6.

DE: Fix bugs.