sys.stdin.read() blocks waiting for EOF in shell.py which will
likely never come if the user provides input on stdin via the
keyboard before the shell starts. Added check for a tty to
skip reading stdin if it's not present.

This still allows piping of code into the shell (which should
have no TTY and should have an EOF) but also doesn't cause it
to hang if multi-line input is provided.

Backport of 4e78e389 from master.

Backport of a29fce89 from master.

As of cf546e11, this is the
canonical way to invoke the static tag.
Backport of 084573c7 from master.

Backport of 44f98f78 from master.

Regression in fc6528b2.

Backport of 834c4ec8,
217f82d7, and
dc5e75d4 from master.

Backport of 6752c275 from master.

Backport of 38f3de86 from master.

Backport of f07091a3 from master

Backport of a1ffbfb8 from master

Backport of cecd6561 from master.

Backport of 1b49b792 from master.

Backport of b8b1d8ca from master.

Backport of 82f286cf from master.

Backport of e90af8ba from master.

Support for passing bytestrings to the database API was removed in
301de774.
Backport of f5d9ee11 from master

Backport of d093e01e from master.

Backport of 18e4ade7 from master.

This reverts commit f3f31b0f.

This reverts commit a47dd99c.

SessionBase.decode() is the inverse operation to SessionBase.encode().
As SessionBase.encode() always returns a string, SessionBase.decode()
should always be passed a string argument. Fixed the file backend, which
was the only backend still passing a bytestring.

Backport of bdae19cf from master

The mysqlclient cursor attribute `_last_executed` is always stored as
bytes. Decode it.

TextField values are already type str. No need to decode.

Backport of efd8a82e from master

Support for bytestring templates was removed in
3a148f95.
Backport of 3212008b from master

Backport of 31edb106 from master.

Backport of 7598cd47 from master.

Backport of 72066010 from master.

Backport of f83a689f from master

Backport of b3b47bf5 from master.

Backport of 92ccc391 from master

Backport of 0b3b7c4b from master

Backport of dc28c0fa from master

Backport of 2e86710d from master

Backport of 7040e638 from master

Backport of fb7fd884 from master

Backport of a7284cc0 from master

Thanks Claude Paroz & Tim Graham for collaborating on the patch.

# Conflicts:
#	tests/auth_tests/test_views.py

Backport of a4932be4 from master

Backport of d37ed400 from master