Update version to 1.6.0
add data/ to gitignore
fixup python 2/3
Two columns in frequencyList
Enable save spectrum data only when data exist
Implement copy frequency table
Display intensities in %
rename frequencyList -> spectrumTable
Reorder import headers
Fix svg resize
Show always on top SVG on load
Add 'Generic Output file format' format
Fix axes clearing
fixup rcc rule in Makefile
svg in main window
implicit H
mpl toolbar is QToolBar
canonical smiles as title
largest possible molecule drawing