Correction popup

[jchartrand]

New popup triggered by new 'correction' button described in issue #50 #50

Fields:

a) Plain text box (label = Correction)

b) four radio buttons with group title 'certainty' and individual labels:

definite
reasonably certain
probable
speculative

c) three radio buttons with group title 'type' and individual labels:

OCR
typographical
other

-In CWRC-TEI serialize as:

<sic><corr cert="definite" type="typographical" ana="Autumn">Antony</corr><sic>
where the value entered for the correction goes into the 'ana' attribute

-In Orlando serialize as:

<SIC CORR="French">Fernch</SIC>
Drop any entered value for type and certainty for now.