Fixed issue in Jm_Console_Output::colorize()

colorize() didn't respected the ansiEnabled flag and / or didn't
consulted assumeIssaty() so far. Have changed this.
Fixed additional issues with the ansi enabled flag

The methods Jm_Console_Output::clear(), ::eraseln(), ::cusorPosition(),
::cursorback(), ::savecursor(), ::restorecursor(),
::getScreenDimensions() didn't respected the ansiEnabled flag. Added the
checks.