[BUG] Relative path in ResourceMonitor

[oesteban]

Summary

This

nipype/nipype/utils/profiler.py

Line 43 in 502fc63

self._fname = fname

should be an absolute path (it isn't).

Actual behavior

It doesn't seem to break things, but this may be the origin for weird readings in the last line of the monitor files. The directory may change before the file descriptor is open.