[client] improve sync notification
[server] improve seaf_dir_from_data and calc_last_modified
[server] Improve performance for displaying deleted files.
[win] Improve "mmap" wrapper for Windows.

* Should not call die() function.
* Add warning for mmap errors.
Disable translation in Mac
[win] Fix some compile warnings.
[sripts] respect non-default seafile-data dir in seahub.sh
update version to 1.4.5
make distcheck pass
fixed a bug in get_dir_size
[linux] install seafile/web to /usr/share/seafile/
[client] rename ccnet-web.sh to seafile-web
[linux] use rsync instead of cp when install web/
[client] add man pages for programs
improve seafile-admin

* Make the seafile-admin script generated the same directory layout as
the server release scripts do
[server scripts] allow server name to start with digit
fixed some spelling errors
[linux] don't use rsync when installing web/
[http] Fix a compile warning.
modify server script to use on raspberry pi