Make errors less fatal, closes #215

Instead of using 'echoerr' and essentially breaking the plugin after
that problems are now reported as warnings with 'echomsg'. They will
also only be shown once for a particular problem.
Don't assume all types define 'ctagstype'
Add simple inspect() debug function
Small doc fix
Better JavaScript ctags config, courtesy of David Fishburn
Reprocess files if filetype changes, closes #228
Add option to arrange Tagbar window vertically
Add mappings for moving through folds, closes #224
add tagbar to support Rust language
comment out the checking for Ctags
let s:known_types.rust = type_rust
 add rust tagbar support with character-based rust.c
method : f ==> F
move 'method' to 'interface'
 tagbar document to support Rust
 keep line to short <= 80 columns