add derivation-generation logic to import.js

[bt2901]

Processed 18458 records...
Added 21622 derived word forms.
408 derived words already exist.

The result is strings like these added to some files:

nouns-neuter.json:
["32631>0","#n.vnoun.","žžeńje",""],
["29639>0","#n.vnoun.","oslěpnųťje",""],
["14817>0","#n.vnoun.","osloženjeńje",""],
["7>0","#n.vnoun.","osųđańje",""],

adjectives.json:
["4475>1","#adj.ptcp.","sȯvětujųćí",""],
["4475>2","#adj.ptcp.","sȯvětujemý",""],
["4475>3","#adj.ptcp.","sȯvětovavši",""],
["4475>4","#adj.ptcp.","sȯvětovaný",""],
["1907>0","#adj.comp.","speciaľnějši",""],
["1907>1","#adj.comp.","najspeciaľnějši",""],

Some care was taken to exclude multiword expressions like

["35354>0","#n.vnoun.","ne ljubjeńje",""],
["1398>0","#adj.comp.","bolje sovětski",""],
["1398>1","#adj.comp.","najbolje sovětski",""],

and "forbidden" verb participles (e.g. "spimy").

Some statistics. Out of 408 "already existing" words, 393 are verbal nouns like "rěšeńje". The rest are:

pfap: [ 'byvši', 'krasivši', 'legši', 'zabolěvši' ]
comparative: [
  'blizši',   'lučši',  'glųbši',   'legši',
  'menši',    'nizši',  'starějši', 'širši',
  'vysši',    'gorši'
]
superlative: [ 'najstarějši' ]

Apparently, the statistics do not take into account entries like starějši, starši. I'm not sure how bad is it.

[coveralls]

Pull Request Test Coverage Report for Build 9474008240

Details

• 0 of 0 changed or added relevant lines in 0 files are covered.
• No unchanged relevant lines lost coverage.
• Overall coverage remained the same at 92.36%

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Totals
Change from base Build 9160404496:	0.0%
Covered Lines:	1630
Relevant Lines:	1708

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💛 - Coveralls

[coveralls]

Pull Request Test Coverage Report for Build 9506583270

Details

• 0 of 0 changed or added relevant lines in 0 files are covered.
• No unchanged relevant lines lost coverage.
• Overall coverage remained the same at 92.36%

---

Totals
Change from base Build 9160404496:	0.0%
Covered Lines:	1630
Relevant Lines:	1708

---

💛 - Coveralls

[coveralls]

Pull Request Test Coverage Report for Build 9506792545

Details

• 1 of 10 (10.0%) changed or added relevant lines in 1 file are covered.
• No unchanged relevant lines lost coverage.
• Overall coverage decreased (-0.5%) to 91.895%

---

Changes Missing Coverage	Covered Lines	Changed/Added Lines	%
src/verb/conjugationVerb.ts	1	10	10.0%

Totals
Change from base Build 9160404496:	-0.5%
Covered Lines:	1631
Relevant Lines:	1718

---

💛 - Coveralls