lbp: improve figure
make: optimizations

Avoid unnecessary dependencies on system headers to be generated. Cache certain variable expansions to improve the Makefile speed. Cleans up redundant code.
scalespace: improve documentation

Adds two new figures and completes text.
Xcode: fix indentation of python files

The indentation was incorrectly set to be the default 2. Python scripts use 4 spaces instead.
webdoc.py: add multiple verbosity levels and improve printed messages

Webdoc was too chatty. This patch allows the verbosity flag to control the amount of information printed on screen. In particular, excessive warnings are suppressed in the first verbosity level.
matlab.mak: cosmetic
impov.h: fix header guard name
doc: add more information about compiling the library
vl_test_fisher.m: fix the reference implementation of the FV
mathop.h: review sqrti, improve doc
ikmeans and hikmeans: large datasets support