Re-arrange the TODO list for readability.

TODO.md

@@ -4,27 +4,27 @@
 
 - [x] use cryptographic hashes for detecting duplicate messages
 - [x] add checking for conflicting command-line options
-- [ ] support for deletion of messages after being matched and displayed
 - [x] ignore .overview when grepping Gnus folders
 - [x] inverted matching
 - [x] recursive search through directories
 - [x] writing selected messages to a new folder
 - [x] deleting selected messages
-- [ ] basic time and date matching
-- [ ] more advanced time and date matching, with strings such as "yesterday"
 - [x] reading messages from standard input
 - [x] run-time selection of file locking method
 - [x] add a debug function
+- [ ] support for deletion of messages after being matched and displayed
+- [ ] basic time and date matching
+- [ ] more advanced time and date matching, with strings such as "yesterday"
 - [ ] Remove the option to recursively traverse directories and instruct the users to run mboxgrep in conjuction with find(1) instead.
 
 ## File formats, encodings and standards
 
 - [x] migrate to pcre2, as pcre is obsolete
+- [x] support for compressed mbox folders
+- [x] support for bzip2 compression
 - [ ] use a more modern hash function than MD5
 - [ ] MIME support
 - [ ] support for GnuPG
-- [x] support for compressed mbox folders
-- [x] support for bzip2 compression
 - [ ] support for XZ-format compression
 - [ ] support for mail folder conversion
 - [ ] improve error detection when a directory is not a Maildir or MH folder
@@ -34,8 +34,8 @@
 ## Miscellaneous
 
 - [x] write Texinfo documentation
+- [x] provide possibility to use flock() instead of fcntl()
 - [ ] configuration files
 - [ ] make use of lockfile library
 - [ ] make use of Solaris' maillock library
-- [x] provide possibility to use flock() instead of fcntl()
 - [ ] provide national language support with gettext()