Adding support for a custom target dir while building, fixing a few issues...

See merge request cds/advligorts!308

Adding support for a custom target dir while building, fixing a few issues where the SITE.ipc folder/file was not created for a fresh build

RCG: Fix $bdroot variable replacement for long library references.

See merge request cds/advligorts!307

Previous code assumed link was top-level, dropping any part of the reference after the second slash.
This led to a link to the wrong subsystem.

Improved error message when linked subsystem is not found in library.

Note that the search code doesn't verify the full path of the link.  If there were another part of the same name
but with different parent subsystems, the RCG would happily link to that instead.  This problem is *not* fixed by this patch.

Fixing undefined refrence on debian 11, adding better error messages,...

See merge request cds/advligorts!305

Removing the copy and lib from the path, so you can build the x1tst example without using the run script

Fixing undefined refrence on debian 11, adding better error messages, replacing uses in two file of RCG_DIR with the newer env var RCG_SRC, adding gitignore in test/ directory so you can run the 'run' script without generating files tracked by git

RCG: Add automated tests for building, installing and running models.

See merge request cds/advligorts!293

Some code cleanup, and fixing userspace builds after the last pull request.

See merge request cds/advligorts!304

Adding volatile for memory mapped IO, adding function for kernel space...

See merge request cds/advligorts!300

Fixing typo in file_operations data members

See merge request cds/advligorts!303

Removing the unneeded ExtraSymbols.symvers and cleaning up the FE makefile so...

See merge request cds/advligorts!302

Removing the unneeded ExtraSymbols.symvers and cleaning up the FE makefile so it builds on debian 11

Adding volatile for memory mapped IO, adding function for kernel space timespec retrieval and adding test for the gpstime module

Fixing permissions on scripts that I changed

See merge request cds/advligorts!299

Cleaning up findSharedMemory usage, fixing error checks on the returned...

See merge request cds/advligorts!297

Remove shared files causing collisions when generating the code for two models at the same time. Also speed up generation time by 10s per model.

See merge request cds/advligorts!296

Reduce foot print of cycle1 -> cycle2 dma size change for fast adcs.

See merge request cds/advligorts!298

Old code for changing DMA size from the ( possibly smaller ) first cycle
was too expensive in some sense, causing momentary channel hopping on the
ADC when run at 65k and time_shift=0.

The new code just changes the size value of an already existing DMA
module instead of totally recreating it.

Cleaning up findSharedMemory usage, fixing error checks on the returned pointer, consolidating code for findSharedMemory() and findSharedMemorySize() so we don't have duplicate, removing unused sprintf in both functions