implemented (bad) partial derivatives for single-hidden-layer nets
fixed partial derivatives normalization issue (input normalization)
Derivatives changes (added elm, some corrections but still bad)
Changed reactivity handling (still a little buggy)
added working derivatives file
Moved summary to the left panel
added crt.fits list
Set up summary to read from fits
Changed training message behaviour
removed all "current." variables, replaced by crt.fits
Replaced smoothing splines by lowess
cosmetic changes
Fixed partial derivatives bug, made new file input clear previous nets
changed "chosen.fit" to "active.fit"
Changed summary, changed variable choice reactivity
Implemented new variable choice, appearance changes
minor change in left summary
Merge branch 'dev'

Conflicts:
	server.R
	ui.R