#11 More patches

[Roine Gustafsson]

Ten smaller patches.
These fix PIXIEHOME environment variable check, adds a output directory to sdrc, fixes sdrc not to abort on a miscompiled shader, some improvments in shader language and error message fixes.

[Roine Gustafsson]

[Eibriel]

38-extendlimits.patch:
39-dostounix.patch:
40-expression.patch:
I'll see it. What problem solves?

41-pixiehome.patch:
Interesting, I'll see it.

42-shaderpath.patch:
44-return.patch:
I'll see it.

46-functionname.patch:
47-forrelax.patch:
What problem solves?

48-errmsg.patch:
Why do the verification "if (firsttype && desttype)" ? What problem solves?

Thanks for the patches!
Regards,
Eibriel