steppers: add absolute position
peplus.c: Documentation update - NW
peplus.c: Slight update - NW
Merge pull request #43 from ramiropolla/upd7810

upd7810: use intermediate flip flops for extended timer/event counter
Merge pull request #44 from ramiropolla/steppers

steppers: add absolute position
Taito device tilemap assert fixes, and clean up of obsolete stuff (nw)
removed duplicated line of code (nw)
minor fixes
there were some typos in stopthie.bin (game still goes in an infinite loop tho)
upd7810: revert to less strict set_input_line

Commit adffc17 implemented more strict irq checks. This caused some
regressions.