[BUG] oRSF output operator does bitwise copy for ints into float buffer

[kzhuang1]

🐛 Bug report

Description of the bug

When using the << operator to output to oRSF class, an int array will be bitwise copied into the float buffer turning a 1 into 1.401e-45 in the output file.

To Reproduce

Steps to reproduce the behavior:

1. create oRSF object e.g. "oRSF outmask("mask.rsf");"
2. have int type array filled with int values like 1s and 0s e.g. "std::vector<int> mMask(myNk);"
3. send int type array to oRSF object using operator << e.g. "outmask << (kernel->mMask);"
4. See error in output file where 1s (and probably all other values are incorrect), e.g. sfdisfil < mask.rsf

Expected behavior

output should be 0s and 1s for mask

Additional context

Most likely cause is just an template that takes any class as input and uses a bitwise memcpy for output in the oRSF class, most likely needs an overload operator that uses proper type conversion rather than bitwise copy.