ADD: SMOG2 in queries can be a string (in addition to a list of strings)

Alexey Zhelezovrequested to merge
azhelezo/LHCbDIRAC:smog2str into master

BEGINRELEASENOTES

NEW: for Transformations, SMOG2 query accept a single string.

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Closes #29 (closed)

Edited by Chris Burr

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