choice randomization: better approximation of JR behaviour, fixes #49 #241
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Closes #49
I have verified this PR works in these browsers (latest versions):
Some related problems remain to be solved:
This brings what Webforms does more in line (barring #240) with what Javarosa does, and as such fixes the immediate problem of #49.
I felt it was worth it to be verbose with the comments here, so check those out.
This story is not over yet. Depending on whether we deem it OK to change the seed derivation algo, I'd like to make it value type/length agnostic and would just hash the input in its textual form and derive a seed from that hash - see getodk/javarosa#800. And in that case this code will need to be altered again.