Added some c snippets and snippet switching.
Note snippets changes; tweak fswitch logic slightly.
Use 79-character comment banners.
Add EasyMotion plugin.
Correct a typo.
Note keystrokes for incsearch plugin.
Remove obsolete mappings for Command-T migration.
Use automatic period for certain snippets.
Enable UltiSnips by default only when Python is built into Vim.
Use start-of-line mappings for EasyMotion <Space>j and <Space>k.
Remove obsolete VisualSearch function.