fixed constantly growing WG-file

Even when wg-restore-associated-buffers was nil workgroups file was
bigger and bigger. It's fixed now.
eliminate some warnings
turn off remappings by deafult
wg-restore-associated-buffers nil by default
make settings a bit easier

- use ~/.emacs_workgroups as a default wg-file
- wg-restore-associated-buffers is nil by default
- desktop-save-mode removed
easy install + autocreate first workgroup

- installation - just activate WG
- changed some default variables (prefix key, session file, morph)
- automatically create first workgroup
reduce spaces in code blocks
fixed typo
disabled autocreation on first WG
test command for workgroups + ido
fixed autocreation of first workgroup
try directory restoring a missing file
basic support for python shell buffer

Restoring inferior-python-mode buffer in a directory
it was started
basic support for R-shell buffer
restoring prolog interpreter + fixes

- switching to Python shell now works
- checking directory existence for Magit
- restore prolog shell
remove* replaced with wg-remove*
require cl, cl-lib
reorganized description, changed link

- changed link to special buffers help page
wg-mode-line-only-name t by default