FmcAdc100M14b4cha SPEC gateware release 4.1

Changelog:
- Bug #1299: hdl: dpram0 erroneously instantiates dual clock memory
- Feature #937: hdl - Remaining shot register in single-shot mode
- Feature #1266: Increase on-chip memory for multi-shot acquisitions
- Feature #1290: Replace "decimation" with "under-sampling"
- Feature #1297: Clean up and update build process
- Feature #1298: Clean up and update simulations and testbenches
This tag has no release notes.