Improved orthographic rules for suffixes

More sophisticated spelling rules are needed for when to delete vowels at the ends of words, when to double consonants at the ends of words, and when to change "y" to "i", before adding suffixes. It's not yet certain whether a set of reliable rules exist to determine this or whether it will require checking against an exhaustive whitelist of acceptable inflected forms. For example, Plover needs to know that adding "ed" to "deter" will result in "deterred", but adding "ed" to "meter" will result in "metered".

As an intermediate step to either hard-coding more reliable spelling rules or instituting a whitelist of correct spellings, a spelling stopgap stroke could be created, which copies the last translated stroke into a misspelling log (for later uploading to devs working on the orthography problem) and then retranslates the previous stroke without spelling rules applied. E.g., if "meterred" appears, user could invoke the stopgap command, which would retranslate it simply as root stroke + suffix, without invoking the consonant doubling rule.