fixed various improperly formated tags including one record delimeter (p1612)
removed extra space after the cu001 value in record p2090
removed an extraneous '$' from the 245 $a field for records p2000, p2010, 2012, p2101
added a '$a' before the value in the 700 field for p1926 and p1983

corrected the delimeter from ';$' to ';$c'
p1862.txt:cu300 | 1 | 1 papyrus fragment;$11.3 x 16.9c cm.
p1870.txt:cu300 | 1 | 1 papyrus fragment;$8.7 x 7.1 cm.
p1881.txt:cu300 | 1 | 1 papyrus fragment;$15.5 x 10.2 cm.
p1926.txt:cu300 | 1 | 1 papyrus fragment;$4.5 x 4.4 cm.

p16: 600 tag (cu653), removed the $c
p1993: changed the double dates to a single date, =046  \\$aq$c622$e915