Merge pull request #1 from thomasp85/master

updating mzID fork on vladpetyuk account
Merge pull request #2 from thomasp85/master

updating mzID fork on vladpetyuk account. 2
testing speed-up in attrExtract
reverse previous update
adding scan numbers
change from scanNums to less specific name "extra"
Merge pull request #3 from thomasp85/master

catching up
Merge pull request #23 from vladpetyuk/master

adding scan number(s)