Bug fixes and additional features

[dineshpinto]

Hi Olivier,

This is an awesome library, thank you.

However, I have noticed some bugs that could be fixed and nice features to be added. I have done that in this PR.

This is a summary of them:

• Replace LaTeX $\\mu$ with Unicode µ -- LaTeX strings in Python need to be raw so this does not show correctly, but anyway, there is no real need for LaTeX here as µ is part of the Unicode standard
• filter_lowpass() references an internal method getRmask() which does not exist -- I have implemented this radius mask in the function get_radius_mask_from_center()
• I have added two additional filters -- filter_gaussian(sigma) and filter_percentile(), these are nice features to have and are just thin wrappers around the corresponding scipy.ndimage functions
• np.float does not exist anymore, this is replaced with float
• When doing profile maps, the linestyle on the image cannot be currently controlled. I have added a linestyle optional which can be added via a kwarg

None of these are breaking changes in my testing.

Let me know what you think.

Cheers, Dinesh

[scholi]

Awesome. Thank you very much. I am not actively using the library anymore as I have changed field. Any bugfixing are welcome