GET file added
Just minor changes and bug fixes
- Adding a function GET (Ctrl-O), which inserts the content of a file before the current line
- Both HOME and END stop at start of text is passing by on their way to their destination.
- Flag allowing to replace spaces by Tab when writing the file, opposite to what is done while reading. Tabsize is 8. A tab is inserted whenever possible, even if it replaced a single space character.
- Fixed a mild amnesia in UNDO