Entirely rework cycle canceling algorithms (#180)

- Move the cycle canceling algorithms (CycleCanceling, CancelAndTighten)
into one class (CycleCanceling).
- Add a Method parameter to the run() function to be able to select
the used cycle canceling method.
- Use the new interface similarly to NetworkSimplex.
- Rework the implementations using an efficient internal structure
for handling the residual network.
This improvement made the codes much faster.
- Handle GEQ supply type (LEQ is not supported).
- Handle infinite upper bounds.
- Handle negative costs (for arcs of finite upper bound).
- Extend the documentation.

syntax: glob

*.obj

*.orig

*.rej

*~

*.o

*.log

*.lo

*.tar.*

*.bak

Makefile.in

aclocal.m4

config.h.in

configure

Makefile

config.h

config.log

config.status

libtool

stamp-h1

lemon/lemon.pc

lemon/libemon.la

lemon/stamp-h2

doc/Doxyfile

cmake/version.cmake

.dirstamp

.libs/*

.deps/*

demo/*.eps

m4/libtool.m4

m4/ltoptions.m4

m4/ltsugar.m4

m4/ltversion.m4

m4/lt~obsolete.m4

syntax: regexp

(.*/)?\#[^/]*\#$

(.*/)?\.\#[^/]*$

^doc/html/.*

^doc/.*\.tag

^autom4te.cache/.*

^build-aux/.*

^.*objs.*/.*

^test/[a-z_]*$

^tools/[a-z-_]*$

^demo/.*_demo$

^.*build.*/.*

^doc/gen-images/.*

CMakeFiles

DartTestfile.txt

cmake_install.cmake

CMakeCache.txt