message: Make `:bf[irst]` and `:bl[ast]` aliases of `:tabfir[st]` and  `:tabl[ast]`
diff: @@ -93,13 +93,13 @@ export const builtinExCommands: ReadonlyArray<[[string, string], ArgParser | und
  [['bd', 'elete'], BufferDeleteCommand.argParser],
  [['be', 'have'], undefined],
  [['bel', 'owright'], undefined],
  - [['bf', 'irst'], undefined],
  - [['bl', 'ast'], undefined],
  + [['bf', 'irst'], TabCommand.argParsers.bfirst],
  + [['bl', 'ast'], TabCommand.argParsers.blast],
  [['bm', 'odified'], undefined],
  [['bn', 'ext'], TabCommand.argParsers.bnext],
  [['bo', 'tright'], undefined],
  [['bp', 'revious'], TabCommand.argParsers.bprev],
  - [['br', 'ewind'], undefined],
  + [['br', 'ewind'], TabCommand.argParsers.bfirst],
  [['brea', 'k'], undefined],
  [['breaka', 'dd'], Breakpoints.argParsers.add],
  [['breakd', 'el'], Breakpoints.argParsers.del],
  @@ -524,7 +524,7 @@ export const builtinExCommands: ReadonlyArray<[[string, string], ArgParser | und
  [['tabnew', ''], TabCommand.argParsers.tabnew],
  [['tabo', 'nly'], TabCommand.argParsers.tabonly],
  [['tabp', 'revious'], TabCommand.argParsers.bprev],
  - [['tabr', 'ewind'], undefined],
  + [['tabr', 'ewind'], TabCommand.argParsers.bfirst],
  [['tabs', ''], undefined],
  [['tags', ''], undefined],
  [['tc', 'd'], undefined],
  