R=rsc https://codereview.appspot.com/15100044

- the cursor is on the last line - the navigation would put the cursor over the tag of the following text R=rsc CC=smckean83 https://codereview.appspot.com/15280045

R=rsc https://codereview.appspot.com/13982043

R=rsc https://codereview.appspot.com/13988043

R=rsc https://codereview.appspot.com/13984043

R=rsc https://codereview.appspot.com/13983043

R=rsc https://codereview.appspot.com/13981043

R=rsc https://codereview.appspot.com/13980043

R=rsc https://codereview.appspot.com/13352057

R=rsc https://codereview.appspot.com/13504049

R=rsc https://codereview.appspot.com/7988047

This allows commands in bin subdirectories. R=rsc CC=plan9port.codebot https://codereview.appspot.com/13254044

Introduces the Search command for mailboxes. Arguments passed are treated as one space- separated string, passed on to mailfs' IMAP search interface. R=rsc, david.ducolombier CC=plan9port.codebot https://codereview.appspot.com/13238044

Mail services (such as Google Mail) will often have directories with names that contain spaces. Acme does not support spaces in window names. So, replace spaces in mail directory names with the Unicode character for visible space. The code is a bit of an over-approximation and generally non-optimal. R=rsc, david.ducolombier, 0intro CC=plan9port.codebot https://codereview.appspot.com/13010048

UTF-8 searches with the SEARCH command must be conducted in two steps: the first sends the SEARCH command with the length of the UTF-8 encoded string and the second sends the literal search term. The searches need to not be quoted. R=rsc, david.ducolombier, rsc, 0intro CC=plan9port.codebot https://codereview.appspot.com/13244043