[Fix #1813] Insert tab in Python REPL
[Fix #1813] Insert tab in Python REPL

Currently, when tab is pressed, spaces are inserted. It makes Python
REPL unable to recognize code indentation. We must use tab to indent.
Setting indent-tabs-mode is buffer local, so it does not affect its
value in other buffers.

tsonntag/dotemacs,tsonntag/dotemacs,tsonntag/dotemacs,tsonntag/dotemacs