Update vimrc

Replace clang_complete with vim-clang.
Update vimrc

Add vim-togglecursor.
Update Xresources

Change uxterm font from DejaVuSansMono to Hermit.
Update zshrc

Use the ${} format for shell variable expansion.
Update zshrc

Refactor getip().
Update zshrc

Add duc() function. It returns information about the size taken by core
files.
Update qtcreator/solarized-dark.xml

Shift some colors around and introduce the diff color options.