make init (and subsequent make) will fail in a confusing way if both tqdm and pip are not installed

[gamestabled]

• split_asm.py should be able to manage tqdm dependency, provided that pip is available
• if pip isn't available, the script will fail, but the build will continue, eventually leading to errors due to some of the split data files not existing
• to fix: fail the build early with a helpful error message, and/or make the dependencies clear and part of the install readme