make -mcd optional in QuickMagic ldeo import
make -mcd optional in QuickMagic orient.txt import
make mcd optional in QuickMagic AzDip import; fix a few things in kly4s import
new leastsquares curvature calculation
troubleshooting thellier_gui dang/int_dang problem
comments isolate the source of these errors when only 1 or 2 specimens pass muster in thellier auto interpreter:
RuntimeWarning: Degrees of freedom <= 0 for slice
RuntimeWarning: invalid value encountered in double_scalars
change select_ncn widget to accept customizable ncn options.  update QuickMagic 2G_bin ncn options to be correct
correcting QuickMagic PMD import ncn options
fix select-ncn in QuickMagic orientation import
switch back to using old ErMagicBuilder