double NM in FFGSPI, add error message if NBMAG>NM
Restore solSketch.eps in Zlst1.tex
Update FFAG-SPI in guide (Part A)
Add info on DNEWT in guide (Part B)
Add line in zgoubi.res if DNEWT is enabled
Simplify DNEWT implmentation in rffag.f, ffgspi.f
Add example FDspiral lattice in exemples/FFAG/spiralFFAG demonstrating use of DNEWT
Update ffgspi - speed up FFGSPF and correct bugs in 4th order part of FFGSPA