Add support for relative unit paths (relative to the dpr)

[Marius van Zwijndregt]

In one of our project, we use relative paths to include our units;

Part of the dpr:

uses Forms, SysUtils, xmldom in '..\src\xmldom.pas' {xmldom}, etc

Currently, when compiling the units won't resolve. It would be great if this were to be supported (set the execution path of dcc32?)

[George Bakhtadze]

Fixed in 1.01. Yet, to enjoy full support - error highlighting etc - all root directories with units should be marked as sources in module settings.