Revert "Use locale-aware string comparision to sort the chapters"

This reverts commit afd8c4af41d48fe4e913608a2e05f6aaa46c64fd.
Revert "Sort the tree view column, not the model directly"

This reverts commit 8daa603590cd403920cbb9b98595975ef0ba8d24.

Conflicts:
	gucharmap/gucharmap-chapters-view.c

https://bugzilla.gnome.org/show_bug.cgi?id=620180
Revert "Also sort the block chapters list"

This reverts commit d3607d59adc92abe4c756fe755a59d69e4ece22c.

https://bugzilla.gnome.org/show_bug.cgi?id=620180