doc: Disable doxygen options marked as obsolete in newer versions

# A mapping has the form "name=value". For example adding "class=itcl::class"

# will allow you to use the command class in the itcl::class meaning.

TCL_SUBST              =

# TCL_SUBST              =

# Set the OPTIMIZE_OUTPUT_FOR_C tag to YES if your project consists of C sources

# only. Doxygen will then generate output that is more tailored for C. For

# Minimum value: 1, maximum value: 20, default value: 5.

# This tag requires that the tag ALPHABETICAL_INDEX is set to YES.

COLS_IN_ALPHA_INDEX    = 5

# COLS_IN_ALPHA_INDEX    = 5

# In case all classes in a project start with a common prefix, all classes will

# be put under the same header in the alphabetical index. The IGNORE_PREFIX tag

# interpreter (i.e. the result of 'which perl').

# The default file (with absolute path) is: /usr/bin/perl.

PERL_PATH              = /usr/bin/perl

# PERL_PATH              = /usr/bin/perl

#---------------------------------------------------------------------------

# Configuration options related to the dot tool

# the mscgen tool resides. If left empty the tool is assumed to be found in the

# default search path.

MSCGEN_PATH            =

# MSCGEN_PATH            =

# You can include diagrams made with dia in doxygen documentation. Doxygen will

# then run dia to produce the diagram and insert it in the documentation. The