doc: emphasize options names by using bold font instead of fixed width
docs: sort plugins listings in alphabetic order
Encode to ascii,not utf8.Replace missing chars
Merge pull request #1073 from multikatt/discogs_encodeerr

Problem with non-ascii characters when using the discogs plugin and oauth PR
Comment about workaround in #1073
Merge pull request #1072 from Kraymer/doc-sort-plugins

docs: sort plugins listings in alphabetic order
Merge pull request #1071 from Kraymer/doc-boldify-options

doc: emphasize options names by using bold font instead of fixed width
Bold options in lastimport docs (#1071)