Bug 735198 - plantUML requires epstopdf for building PDF files

Added conversion from eps to pdf, analogous to dia and msc
Bug 634763 - Fortran: external subroutine as dummy argument not recognized

Besides as as attribute the external can also be used as "type"
Previous commit (pull request 121) was reverted (pull request 122) due to warning message.
Support charset option for PlantUNL

Use as charset for PlantUML the same character set as de INPUT_ENCODING of the input source
Support plantuml !include statement

Support the plantuml !include statement by using the newly defined PLANTUML_INCLUDE_PATH
Merge pull request #223 from albert-github/feature/bug_735198

Bug 735198 - plantUML requires epstopdf for building PDF files
Merge pull request #224 from albert-github/feature/bug_634763_2

Bug 634763 - Fortran: external subroutine as dummy argument not recognized
Merge pull request #225 from albert-github/feature/plantuml_charset

Support charset option for PlantUML
Merge pull request #226 from albert-github/feature/plantuml_include

Support plantuml !include statement