Add support for OUTPUT_BUFFER_SIZE, TIME_LIST, and ITERATION_LIST

[jczech]

Currently, there is no way to adjust the OUTPUT_BUFFER_SIZE for reaction data.

Also, instead of simply support a step value, we could support custom time and iteration lists. In MCell, an ITERATION_LIST might look like this:

ITERATION_LIST = [[10 TO 100 STEP 10], [200 TO 500 STEP 100]]

which might result in output like this:

10 97
20 96
30 96
40 95
50 95
60 94
70 94
80 92
90 89
100 88
200 82
300 75
400 66
500 65

[cnlbob]

The custom time and iteration lists have not been addressed, but the following commit from June 30th, 2016 added an OutputBufSize field to the Reaction Data Output panel:

Commit: d8c29a8c77c94c48ff4dc4065bebff25a9358693