fix lintian issues

[jlblancoc]

libmrpt-common-dev: file-references-package-build-path [usr/include/mrpt/mrpt_paths_config.h]
libmrpt-common-dev: file-references-package-build-path [usr/include/mrpt/version.h]
libmrpt-math-dev: package-contains-empty-directory [usr/include/mrpt/math/include/mrpt/3rdparty/]
mrpt-apps: spare-manual-page [usr/share/man/man1/benchmarking-image-features.1.gz]
mrpt-apps: spare-manual-page [usr/share/man/man1/prrt-navigator-demo.1.gz]
mrpt-apps: spelling-error-in-binary supression suppression [usr/bin/benchmarkingImageFeatures_GUI]
mrpt-apps: spelling-error-in-binary writting writing [usr/bin/ptg-configurator]
mrpt source: unused-license-paragraph-in-dep5-copyright fsfap [debian/copyright:758]
mrpt source: unused-license-paragraph-in-dep5-copyright gpl-3+ with autoconf exception [debian/copyright:779]

[jlblancoc]

Done in:

• cf63a7051b5fe0c557ff33bb6b294028416a61eb
• c666128824b1c4011d79bb31f97367ba14a3c32c
• 464f07187eb80a8ce0698ed337dd0bf41dabf59c