latex: add option to put literal block captions before or after

According to ``literalblockcappos`` setting in ``'sphinxsetup'``, (t)op
or (b)ottom, the caption will be typeset before or after the literal
block. If typeset above, its distance to frame is now identical to the
setting used for captions of tables (one half of the baseline).

Further keys ``verbatimcontinuedalign`` and ``verbatimcontinuesalign``
allow to horizontally align the continuation hints relative to the
literal block contents: either (l)eft, (c)enter, or (r)ight.

doc/latex.rst

@@ -189,14 +189,25 @@ The available styling options
     default ``true``. Tells whether long lines in :rst:dir:`code-block`\ 's
     contents should wrap.
 
+``literalblockcappos``
+    default ``t`` for "top". Decides the caption position. Alternative is
+    ``b`` ("bottom").
+
+    .. versionadded:: 1.7
+
 ``verbatimhintsturnover``
-    default ``false``. If ``true``, code-blocks display "continued on next
+    default ``true``. If ``true``, code-blocks display "continued on next
     page", "continued from previous page" hints in case of pagebreaks.
 
     .. versionadded:: 1.6.3
-       the default will change to ``true`` at 1.7 and horizontal positioning
-       of continuation hints (currently right aligned only) will be
-       customizable.
+    .. versionchanged:: 1.7
+       the default changed from ``false`` to ``true``.
+
+``verbatimcontinuedalign``, ``verbatimcontinuesalign``
+    default ``c``. Horizontal position relative to the framed contents:
+    either ``l`` (left aligned), ``r`` (right aligned) or ``c`` (centered).
+
+    .. versionadded:: 1.7
 
 ``parsedliteralwraps``
     default ``true``. Tells whether long lines in :dudir:`parsed-literal`\ 's
@@ -356,10 +367,9 @@ Macros
      with LaTeX packages.
 - more text styling: ``\sphinxstyle<bar>`` with ``<bar>`` one of
   ``indexentry``, ``indexextra``, ``indexpageref``, ``topictitle``,
-  ``sidebartitle``, ``othertitle``, ``sidebarsubtitle``,
-  ``theadfamily``, ``emphasis``, ``literalemphasis``, ``strong``,
-  ``literalstrong``, ``abbreviation``, ``literalintitle``, ``codecontinued``,
-  ``codecontinues``.
+  ``sidebartitle``, ``othertitle``, ``sidebarsubtitle``, ``theadfamily``,
+  ``emphasis``, ``literalemphasis``, ``strong``, ``literalstrong``,
+  ``abbreviation``, ``literalintitle``, ``codecontinued``, ``codecontinues``
 
   .. versionadded:: 1.5
      these macros were formerly hard-coded as non customizable ``\texttt``,