Correcting some unknown Part of Speech tags

[todd-cook]

Correcting some unknown Part of Speech tags

Some words are tagged with an unknown part of speech tag: "---------"
But many of the unknowns can be corrected and reasonably resolved.

This PR aims to improve the POS tag quality for the latin corpus.

People processing these tag sets will likely want to handle or drop the rest of the unknowns,
or unknowns between punctuation (i.e. alternate readings) as indicated below.

Corrections:

1. An abbreviated noun in apposition to a name is attracted to the same declension (see Greenough, section 282, Apposition)

e.g.
<word id="5" form="L" lemma="L1" postag="---------" relation="ATR" head="7"/>
<word id="6" form="." lemma="PERIOD1" postag="u--------" relation="AuxG" head="5"/>
<word id="7" form="Sullae" lemma="Sulla1" postag="n-s---mg-" relation="ATR" head="4"/>
2. Obvious corruptions in the sequence of tags in the text, e.g.:
<word id="5" form="po" lemma="other" postag="---------" relation="XSEG" head="6"/>
<word id="6" form="puli" lemma="populus" postag="n-s---mg-" relation="ATR" head="4"/>
<word id="7" form="Romani" lemma="Romanus1" postag="a-s---mg-" relation="ATR" head="6"/>
or:
<word id="4" form="c" lemma="que1" postag="---------" relation="COORD" head="1"/>
<word id="5" form="ne" lemma="ne1" postag="d--------" relation="AuxZ" head="6"/>

...etc.

Items not corrected:

1. Greek characters represented in Arabic fonts/transliterated Greek passages, e.g.:
   <word id="1" form="ma" lemma="other" postag="---------" relation="AuxZ" head="3"/>
<word id="2" form="/" lemma="SLASH1" postag="u--------" relation="AuxG" head="1"/>
<word id="3" form="deia" lemma="other" postag="---------" relation="AuxY_ExD_OBJ" head="0"/>
<word id="4" form="perima" lemma="other" postag="---------" relation="AuxZ" head="6"/>
2. Bracketed editorial items; partial words, e.g.:
   <word id="21" form="[" lemma="bracket1" postag="u--------" relation="AuxG" head="22"/>
<word id="22" form="dict" lemma="other" postag="---------" relation="XSEG" head="24"/>
<word id="23" form="]" lemma="bracket1" postag="u--------" relation="AuxG" head="22"/>
<word id="24" form="ita" lemma="ita1" postag="d--------" relation="PRED_CO" head="19"/>

Texts used:

Source citations; corrections against Perseus texts
Sallust’s Bellum Catilinae (2007, 2nd ed.) by J. T. Ramsey
Sallust’s Bellum Catilinae, 2018, Geoffrey Steadman
Petronius Cena Trimalchionis, 2018, Geoffrey Steadman