added a smarter zero handling and the option to specify and absolute variation
multiple variability for each column
bugfix
fixed bug in the way sdev is handled
small changes and bugfixes
Update sampleFun.R
Update sampleFun.R
Merge pull request #1 from marcogarieri/userfriendly

Userfriendly
Add column names
Merge pull request #2 from marcogarieri/userfriendly

Add column names
fixed a couple of requests from Natalia
removed bad files