[FIX] Fix preallocation bug for lsqrdivide

The size of the preallocated x was totally wrong, instead of x = zeros(size(b)) it should have been x = zeros(size(A,2), size(b,2))
Merge branch 'Thomas'
assertion for finest==0 and small m and n resulting in nbscales<2
just typo
simple counter test
set sweepflag in opMask to false (can't handle sweep); other operators may also need to be checked again
[ADD] Added test for opMask
[FIX] Fixed sweepflag bug in some operators
fixed isposintscalar to spot internal for MATLAB > 2011B
[ADD] Added unsupported data type warning in mtimes
reverted warning for distributed in mtimes; add again after April 2013 software release
[ADD] Expanded mtimes to support oppFoG
[FIX] Merged conflicting comments in mtimes
[ADD] Cleaned up and updated TODO list
[FIX] Fixed TODO formatting
[ADD] Added opNull and tests