simplify main function
move command line parsing logic into its own module
refactor command functions into a commands namespace
refactor error types into an errors module
use BufReader instead of direct File interface
minor fixes for revlog parser
Add a bare-bones hg status implementation
use structopt instead of clap
match on subcommand names
rework error handling a bit
match on subcommands
refactor to use snafu
move content and header into entry module
refactor revlogs into submodules for content, headers, and entries
refactor revlog-handling code into a revlogs module
move everything to the root of the repo
make pretty-printing revlog content try to interpret as utf-8 and if that fails display as ascii-escaped text
remove debug print
panic if we're handed a non-inline revlog5~