Feature Request: init with several '.aspell.{lang}.pws' files

[OlDor]

hi,

thanks for the great library!

here is a minor improvement:

1. assume i want to add 100 new people names (which Aspell is not aware of).
2. i would add them using 'addtoPersonal' + 'saveAllwords', everything looks good.
3. now assume i want to also add 100 new city names.
4. i would again use 'addtoPersonal' + 'saveAllwords', results would concatenate, everything looks good.
5. imagine i now want to replace the old 100 people names with 200 different people names. i can only do this by running the whole procedure again, which becomes an issue once you have datasets with millions of words.
6. it would be better if i could pass several filenames for Aspell to init with