Merge branch 'ht/graphs'

Merge branch 'ht/graphs'

* ht/graphs: (161 commits)
  Address compiler warnings about unused local typedefs
  Fix bugs detected as compiler warnings
  Doc: Adding possible directions for future developments related to graphs
  Draft for hierarchical graph type documentation
  Doc: Break out a separate chapter for hierarchical graphs in user guide
  Doc infrastructure for linking to chapter in user guide
  Doc infrastructure for "Under development" banner
  Documenting the main remaining design challenge for hierarhical graphs
  Initial design ideas for hierarchical graphs
  Finnish the sorting-performance example, being the first log-log plot
  Improved path computation for unused handles at ends of open paths
  New functions from cmath: exp, log, log10, pow
  Relax evaluation during merge sort to be able to handle bigger inputs
  Internal utilities for unwinding the evaluation engine's call stack
  Extended the text/sort test
  Remove debug prints from merge sort
  Improved merge sort, full of debug prints
  Revert "Remove debug prints from merge sort"
  Bugfix: Consify sequences to be sorted
  Enable consification of result of ForcingListContinuation and friends
  ...

# Conflicts:
#	VERSION
#	doc/build/html/Makefile.am
#	doc/parts/bindings/functions.sxml
#	doc/parts/bindings/misc.sxml
#	doc/parts/bindings/simple.sxml
#	doc/parts/extensions/Shapes-Data-conssupport.sxml
#	doc/parts/extensions/index.sxml
#	doc/parts/formats/html.xsl
#	doc/parts/formats/language-elements-html.xsl
#	doc/parts/namespace/Shapes-Numeric-Constant.sxml
#	doc/parts/state-types/containers.sxml
#	doc/parts/state-types/formats/html.xsl
#	doc/parts/syntax/bracket.sxml
#	doc/parts/syntax/compound.sxml
#	doc/parts/syntax/misc.sxml
#	doc/parts/types/containers.sxml
#	doc/parts/types/formats/html.xsl
#	doc/parts/types/special.sxml
#	doc/styles/html/shapes.css
#	edit/emacs/shapes-mode.el
#	examples/applications/doughnut.shape
#	examples/doc/lexiographicSort.shape
#	examples/doc/tutorial-view.shape
#	examples/features/amb.blank
#	examples/features/approximators3d.shape
#	examples/features/cond-impl.blank
#	examples/features/escape.blank
#	examples/features/folds.blank
#	examples/features/sidepaths.shape
#	examples/features/speedtest.shape
#	examples/features/upsample.shape
#	examples/features/values.blank
#	examples/features/warm.blank
#	examples/features/warm2D.shape
#	examples/features/zbuflines.shape
#	examples/problems/choose.shape
#	examples/showcase/mergepaths.shape
#	resources/Makefile.am
#	resources/extensions/Shapes/Control/cond.shext
#	resources/extensions/Shapes/Data/conssupport.shext
#	resources/extensions/Shapes/Geometry/linkpaths.shext
#	source/Shapes_Lang_decls.h
#	source/ast.cc
#	source/ast.h
#	source/astflow.cc
#	source/astfun.cc
#	source/astfun.h
#	source/astvar.cc
#	source/astvar.h
#	source/classexceptions.cc
#	source/classtypes.cc
#	source/coreast.cc
#	source/coreconstruct.cc
#	source/coreelem.cc
#	source/coremisc.cc
#	source/environment.cc
#	source/environment.h
#	source/eval_interactive.cc
#	source/functiontypes.cc
#	source/globals.cc
#	source/globals.h
#	source/shapesexceptions.cc
#	source/shapesexceptions.h
#	source/shapesparser.yy
#	source/shapesscanner.cc
#	source/shapesscanner.h
#	source/shapesvalue.cc
#	source/shapesyylex.ll
#	source/sourcelocation.h