MComix SVN (old)

tools: simplify vector_add, vector_sub, and vector_opposite

Spacing restored, refactoring

- Several constants and functions moved.

Introducing smart_scrolling.py

Use natural sorting for library book view.

Add fast path to file_available for image directories.

Improves performance for opening large directories of files, about 0.2s
for 2500 files, down from 2.5s.

Some cleanup according to PEP8, bugs revealed by static analysis.

Files can now be sorted by size as well.

Open archives in order of last modified date.

Adds an additional preference option to "Advanced", controlling
the order of files as retrieved from FileProvider. Currently
supports sorting by name (previous default) and sorting by mtime.

From: C Nelson <cnelsonsic@...>

Removed unused imports.

Moved gettext-related functions to module i18n, renamed from encoding.