Made pkgconfig variable use consistent.
Fixed framework variables not marked as advanced.
Added multi-window support to iconify test.

Added -a option for creating one window per monitor.  Added -n option
for disabling auto-iconification. Added option descriptions to usage.
Changed all key translation to arrays.
Added glfwCreateStandardCursor.

This function allows the creation of cursor objects using one of several
standard cursor shapes from the current system cursor theme.
Documentation work.
Fixed X11 character input for C locale.

Fixes #396.