The second time init was called, http_200_aliases pointed to a freed pointer
and leaded to a SEGFAULT.

Fixes hanging NFS client.

Necessary for "final" on gcc 4.6.

Reduce header dependencies.

Seeking on NFS or SMB is cheap.  Actually, only HTTP streams are
expensive to seek.  This enables a few features on NFS/SMB files, for
example Ogg tags.

Has been moved to class InputStream long ago.

Generate more detailed error messages.

Eliminate duplicate definition (in input plugin and decoder plugin).

Let the caller decide whether to strip.  Only remove \n and \r
(end-of-line markers).

Look at the buffer first, before trying to read from the file.  This
reduces overhead because we don't refill the buffer after every line.

Revert to the old API before commit e9e55b08, removing unnecessary
bloat.

Checking "!open" did not work with the NFS plugin because that plugin
does not close the file automatically, unlike CURL.

This reverts commit 966c4244.

The commit was bad, because the bug was really in
NfsInputStream::DoRead(); see previous commit.

Avoids off-by-one bug and obsoletes the bug fix in commit 966c4244

More robust and cancellable.

May cause assertion failure.

New base class for other InputStream implementations that run in the
I/O thread.

Fixes assertion failure.