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(cherry picked from commit be39c22a)

(cherry picked from commit 20db4b48)

(cherry picked from commit 526cddd3)

(cherry picked from commit 3566a628)

(cherry picked from commit 70955306)

Set application avatar in Gitlab.

See merge request !10

(cherry picked from commit a2faafb3)

(cherry picked from commit 7e5007ba)

(cherry picked from commit 96b41161)

(cherry picked from commit 8614a7f1)

Small typos

See merge request !9

IPython fixes

See merge request !8

Due to a typo in variable name, certain autocomplete attempts
resulted in only the last character of the input line being
preserved (e.g., "pr" + tab would result in "r").

Do not try to call a reset() on input_splitter when input splitter
is not used; clear our internal buffer instead.

It was removed in IPython 5.x, and had apparently been broken for
many years before that.

In IPython 7.x, input_splitter is an instance of TransformManager2
and does not have indent_spaces attribute. Hence, we need to obtain
the indentation level from result of the check_complete() call on
the interactive shell object (IP).

(cherry picked from commit 54b2e7fc)