many changes, new features bad bug fixes
many changes, new features bad bug fixes

1) some improvements, fixes and comments in `parseDate` method.
2) new `getRes` method which will be used later.
3) new option `showOneSortIcon`, changing default sorting icons used in
case of usage `iconSet: "fontAwesome"`. Small bug fixes in sorting in
case of the usage of `iconSet: "fontAwesome"`.
4) bug fix in case of `labelClasses` column property is not specified.
5) fixing cursor on non-sortable column header.
6) fixing bug with preventing cell editing if currently another cell of
the same  row is editing.
7) fixing in changing of grid width. One should have less cases where
the width of bdiv is a little larger the width of btable. Unneeded
scroll bars should be not shown more.

javapark/jqgrid