Make :SearchNotes work properly without vim-shell (fixes #53)

Add lots of debug logging (related to issue #53)

Document issue #53 in the README

Revert changes from eaf2d447f2*

Release changes to search-notes.py as vim-notes 0.33.1 (issue #53)

Use null handler to avoid noise on stderr (issue #53)

Only enable logging when connected to interactive terminal (issue #53)

Fix superficial Python 3 incompatibilities in search-notes.py*

Make search-notes.py PEP-8 compliant*

Bug fix for git commit message trick in documentation

Improve getting started instructions

Document how to use notes file type for git commit messages

Enable showing code block markers

Update installation instructions

Merge pull request #104: Make concealing configurable