Y-Grid in MM3 did not exclude SeaLevel indicator

Bug reported here:
http://www.postfrontal.com/forum/topic.asp?whichpage=1&TOPIC_ID=7515&#64645
Revert "forgot to reenable SetVisible"

This reverts commit d770ed5d4d9654826a519d0f5822d26ae6d2df1d.
Revert "rework Task Overview"

This reverts commit 3d7f3436767ae14b0201c1522540c6cda9717875.
Revert "Task Overview with additional statistic line and revert button"

This reverts commit a098291d691e8c61f27861edc91888f126456ca9.
Revert "show split FAI sectors when transition between 28% to 25% rule"

This reverts commit 631a19ffc9761294ea3e399c3795509a340132d7.
Fix testbench mode managed exception, not handled by BUGSTOP
Merge branch 'MM3_YGRID_FIX' of https://github.com/AlphaLima/LK8000
Allow PC keys up and down to step in units of 1 (1 kmh, 1 kt) while changing ground speed.
This is necessary expecially while checking MC STF using imperial units.
Revert "Add turnpoint radius for first & last tunrpoint in Task Overview dialog."

This reverts commit 0421d91e3b7abecaee2cd836003dea80da0cc0df.
Fix previous fix of windanalyser and manage somehow exceptions in Calc thread