[main] Remove bitsPerElement parameter from default pimAlloc and pimAllocAssociated

[deyuan]

PR #165 combines multiple changes to dev-alloc branch, which is hard to review. I would suggest we merge this batch of changes to main first for API updates that touch all benchmark apps.

List of changes:

• Remove bitsPerElement parameter from pimAlloc and pimAllocAssociated. Auto derive bitsPerElement from data type by calling newly added pimUtils::getNumBitsOfDataType. Currently all bitsPerElement parameters match with given data type exactly, so they can be safely removed.
• Add misc-bench folder to top-level Makefile. Currently it is not compiled.
• Fix a bug in scale (incorrect associated obj) and print warnings in bitmap and xor.

[fasiddique]

Thank you!