Use paths from build-spec. instead of relative paths

Doxyfile.in

@@ -51,7 +51,7 @@ PROJECT_LOGO           =
 # If a relative path is entered, it will be relative to the location
 # where doxygen was started. If left blank the current directory will be used.
 
-OUTPUT_DIRECTORY       = ../Documentation
+OUTPUT_DIRECTORY       = @PROJECT_BINARY_DIR@/Documentation
 
 # If the CREATE_SUBDIRS tag is set to YES, then doxygen will create
 # 4096 sub-directories (in 2 levels) under the output directory of each output
@@ -127,7 +127,7 @@ FULL_PATH_NAMES        = YES
 # If left blank the directory from which doxygen is run is used as the
 # path to strip.
 
-STRIP_FROM_PATH        =
+STRIP_FROM_PATH        = @PROJECT_SOURCE_DIR@
 
 # The STRIP_FROM_INC_PATH tag can be used to strip a user-defined part of
 # the path mentioned in the documentation of a class, which tells
@@ -548,7 +548,7 @@ FILE_VERSION_FILTER    =
 # You can optionally specify a file name after the option, if omitted
 # DoxygenLayout.xml will be used as the name of the layout file.
 
-LAYOUT_FILE            = DoxygenLayout.xml
+LAYOUT_FILE            = @PROJECT_SOURCE_DIR@/DoxygenLayout.xml
 
 #---------------------------------------------------------------------------
 # configuration options related to warning and progress messages
@@ -610,8 +610,7 @@ WARN_LOGFILE           =
 # directories like "/usr/src/myproject". Separate the files or directories
 # with spaces.
 
-INPUT                  = opm/core tutorials/tutorial1.cpp tutorials/tutorial2.cpp tutorials/tutorial3.cpp examples
-#INPUT                  = tutorials
+INPUT                  = @PROJECT_SOURCE_DIR@/opm/core/ @PROJECT_SOURCE_DIR@/tutorials/ @PROJECT_SOURCE_DIR@/examples/
 
 # This tag can be used to specify the character encoding of the source files
 # that doxygen parses. Internally doxygen uses the UTF-8 encoding, which is
@@ -669,7 +668,7 @@ EXCLUDE_SYMBOLS        =
 # directories that contain example code fragments that are included (see
 # the \include command).
 
-EXAMPLE_PATH           = tutorials/
+EXAMPLE_PATH           = @PROJECT_SOURCE_DIR@/tutorials/
 
 # If the value of the EXAMPLE_PATH tag contains directories, you can use the
 # EXAMPLE_PATTERNS tag to specify one or more wildcard pattern (like *.cpp
@@ -689,7 +688,7 @@ EXAMPLE_RECURSIVE      = NO
 # directories that contain image that are included in the documentation (see
 # the \image command).
 
-IMAGE_PATH             = ../Documentation/Figure/
+IMAGE_PATH             =
 
 # The INPUT_FILTER tag can be used to specify a program that doxygen should
 # invoke to filter for each input file. Doxygen will invoke the filter program
@@ -852,7 +851,7 @@ HTML_FOOTER            =
 # the style sheet file to the HTML output directory, so don't put your own
 # stylesheet in the HTML output directory as well, or it will be erased!
 
-HTML_STYLESHEET        = style.css
+HTML_STYLESHEET        = @PROJECT_SOURCE_DIR@/style.css
 
 # The HTML_EXTRA_FILES tag can be used to specify one or more extra images or
 # other source files which should be copied to the HTML output directory. Note