#620 Single character searches are not rejected when some wildcards are used

[Ahasuerus]

Regular Search prevents users from submitting single character search string, including search strings that use "_" as a wildcard. However, it doesn't prevent users from submitting single character searches when the search string contains '%' or '*'.

[Ahasuerus]

Fixed in biblio/se.py 1.51. Installed in r2016-109 on 2016-07-07. Closing.