v0.3.4

Various small changes and fixes.

What's Changed

• Regenerate value-keys (upper-case id) by @nx10 in #185
• Fix rename value key by @nx10 in #188
• Add dcm2niix package and descriptor Fix #150 by @nx10 in #187
• Various fixes by @nx10 in #189
• convert_xfm by @birajstha in #192
• 3dDespike by @birajstha in #191
• 3dBandpass by @birajstha in #193
• 3dUnifize by @birajstha in #195
• fslsplit by @birajstha in #196
• fslmerge by @birajstha in #194

Full Changelog: v0.3.3...v0.3.4