Gridlink Mail 2.0.0

Two fixes, nothing new to learn.

• Syncing no longer asks the server for more mail per batch than it is willing to hand back, so large folders fill in reliably.
• Settings is drawn with the same palette as the rest of the app instead of its own.

The jump from 1.0.0 is housekeeping: it keeps Gridlink's version numbers from colliding with upstream Sterna's (which already shipped 1.0.1 through 1.6.0).