Some patches

[Vladimir Dronnikov]

Hello!

I've prepared a set of patches.

1. mkswap: remove unnecessary rewind when getting length of swap device

2. mount: support mount helpers. E.g. mount -t ntfs-3g /dev/hda1 /mnt would
first try to exec ntfs-3g binary and if it fails then try to issue mount(2).

3. new xmklock(char *lock_file_name) function. It dies if lock_file_name
file already exists. Otherwise it creates that file and securely deletes it
on exit.
This function is then used by 2 BB applets: microcom and [send|fetch]mail.

4. microcom: now it properly works on piped stdin. Denys, please consider
applying

5. sendmail: converted to sendmail+fetchmail. The latter simply pulls remote
mailbox content into local Maildir.
Fetchmail is being actively developed so any comments are welcome!

Plz, take a look and make some feedback

--
Vladimir
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