Use twips internally for GetScrPos.

Change-Id: I48c674815c95f73722a427fd2d8d9a3dca9b3a6c
ScreenPos calculations in twips too.

Change-Id: Ibc45f414a56e3c4cdf6c7f384d561938382c1653
Remove incorrect fudge factor.

Change-Id: I3a8d2b2ca1f90a07bd9fffd9e33f59b23671569c
We want to keep nPPTX/Y for our old scaling.

Change-Id: Ia10baf8eebeb92c421066a392387a1ad71e56ce9
Don't abort rendering if Android window 'minimized'.

This simply has no relevance to tiled rendering.

Change-Id: Iee348cf6792d83d364c33de81415a7cbe0be6a47
Adjust MapModes for gridwin tiled rendering.

Change-Id: I8d31521d6b22f375c6de413f2070746f4758a431
Use twips internally for FillInfo too.

Otherwise errors sum up leading to tile-mismatches
for tiled rendering.

Change-Id: I5328771a2d7c284870bb028b53fe69a61e00ba6d
TODO: printfun needs fixing (see previous commit).

We don't need this for tiled rendering for now though.

Change-Id: Iac9ed2a4327840ac0af00eb1903484e127fac2c8