Removing --channel from the changes command

Dependencies

• [2] L4JXJHWX pijul/*: reorganize imports and remove extern crate
• [3] VQPAUKBQ channel switch as an alias to reset
• [4] SXEYMYF7 Fixing the bad changes in history (unfortunately, by rebooting).

Change contents

• replacement in pijul/src/commands/channel.rs at line 3
  [4.187014]→[2.2987:3003](∅→∅)
  − use clap::Clap;
  [4.187014]

  [2.3003]
  + use clap::{AppSettings, Clap};
• edit in pijul/src/commands/channel.rs at line 9
  [4.187037]

  [4.187037]
  + #[clap(setting(AppSettings::ColoredHelp))]
• edit in pijul/src/commands/channel.rs at line 19
  [4.187227]

  [4.187227]
  + /// Delete a channel.

  + /// The channel must not be the current channel.
• edit in pijul/src/commands/channel.rs at line 23
  [4.187287]

  [4.187287]
  + /// Rename a channel.
• edit in pijul/src/commands/channel.rs at line 26
  [4.187365]

  [3.935]
  + /// Switch to a channel.

  + /// There must not be unrecorded changes in the working copy.
• edit in pijul/src/commands/change.rs at line 14
  [4.189579]→[4.189579:189638](∅→∅)
  − #[clap(long = "channel")]

  − channel: Option<String>,
• replacement in pijul/src/commands/change.rs at line 21
  [4.189846]→[4.189846:189929](∅→∅)
  − let channel_name = repo.config.get_current_channel(self.channel.as_ref());
  [4.189846]

  [4.189929]
  + let channel_name = repo.config.get_current_channel(None);
• edit in pijul/src/commands/change.rs at line 32
  [4.190284]→[4.190284:190285](∅→∅)
  −
• replacement in pijul/src/commands/change.rs at line 33
  [4.190342]→[4.190342:190911](∅→∅)
  − let file_name = |l: &Local, inode: Position<Option<Hash>>| -> String {

  − if txn.get_revchanges(&channel, hash).is_some() {

  − let inode = Position {

  − change: inode.change.unwrap_or(hash),

  − pos: inode.pos,

  − };

  − format!(

  − "{}:{}",

  − txn.find_youngest_path(&changes, &channel, inode).unwrap().0,

  − l.line

  − )

  − } else {

  − format!("{}:{}", l.path, l.line)

  − }

  − };
  [4.190342]

  [4.190911]
  + let file_name = |l: &Local, _| format!("{}:{}", l.path, l.line);