Merge pull request #6 from wtsi-npg/master

update dev branch from master (I hope)
Merge pull request #7 from wtsi-npg/master

Fixed "pure virtual method called" error, and "dereferencing type-punned...
Added help text and placeholders for QC option
More QC placeholders
Added simple test for QC function
Ignore emacs temp files
Initial changes to support intensity QC metrics
Write sample names and magnitudes to file
Find magnitude with arbitrarily many intensity channels
Use new QC class
Fix signed/unsigned integer comparison warning
Remove main method, call from simtools executable instead
Include QC.o in simtools compliation
Get rid of hello() method, add placeholder for xydiff
Add constructor and Sim instance variable to QC class
Add xydiff computation; remove sim argument from magnitude functions; use fprintf for output
Changed variable names for greater clarity
Changed help messages; require QC output to files (must specify at least one of magnitude, xydiff)
Updated QC tests
Changed QC test filenames