Remember more commands in history.

Remember 100 commands in history instead of the previous 10.
Change swp file directory.

Let the swp file directory be placed under the vim settings directory instead
of being placed directly under home.
Change wildmenu autocomplete.

Show the list of possible matches and autocomplete the longest common substring
when using wildmenu.
Remove keybindings changing navigation for wrapped lines.

Remove keybindings that change the default behavior of some standard
navigation commands to treat different parts of wrapped lines as separate lines
in the editor.
Add some readline style bindings for ex mode.
Use $MYVIMRC variable to refer to vimrc.
Remove unnecessary directory change.

Remove unnecessary directory change in keybinding for locating TODO/FIXME/XXX
in currently opened file. It was a resisue from a similar binding that was used
to grep through several files located in the same directory as the currently
opened file.
Use CtrlP plugin extension for searching tags.
Search upward for tags file.

Search upward for tags file until one is found or the root is reached.