v0.1.5 - inbetween release

some big corruption and segfault issues got fixed, so an inbetween v0.1 - v0.2 release was needed. a lot of to-be v0.2 features are in this as well.

improvements over v0.1:

• redo threading model for previews
• no longer (l)stat each item on selection
• fix numerous edgecases causing segfaults
• drop to shell with with t
• open with o/O
• human readable filesizes
• minor changes to default scripts