first commit of a copy from Dropbox, found by Roi
fixed few remarks by Matlab code analyzer
function doesn't run yet, the error is in global call, etc.
added fullfile everywhere, removed cd(wd), the File is 'green'
piv_poisson is improved to ignore _noflt.txt and _flt.txt andit runs
removed unnecessary check of file_num before concatenating the mean velocity field
piv_poisson is running. with Newmann boundary conditions on the last row it gives more or less correct result in the mean pressure of 2 files in imp_3 or imp3_1/images_3
Merge branch 'master' of github.com:OpenPIV/openpiv_pressure
added /docs