Media paths in TEI-transcripts should be relative

[EleFri]

To use the demo corpus on other computers and especially on linux, the absolute media paths should be relative and "EXMARaLDA-Demokorpus" should be changed to "EXMARaLDA-DemoKorpus" like the folder name under /src/main/java/data/corpora. Maybe the ComaBackend (getMedia-method) should then also be adapted.

EXMARaLDA-DemoKorpus:

<sourceDesc>
            <recordingStmt>
               <recording type="audio">
                  <media mimeType="audio/wav" url="file:/D:/ZUMULT_DEMO/EXMARaLDA-Demokorpus/AnneWill/AnneWill.wav" />
               </recording>
               <recording type="video">
                  <media mimeType="video/mp4" url="file:/D:/ZUMULT_DEMO/EXMARaLDA-Demokorpus/AnneWill/AnneWill_web.mp4" />
               </recording>
            </recordingStmt>
         </sourceDesc>

Example of FOLK:

<sourceDesc>
                <recordingStmt>
                    <recording type="audio">
                        <media mimeType="audio/wav"
                            url="../../media/audio/FOLK/FOLK_E_00001_SE_01_A_01_DF_01.WAV"/>
                    </recording>
                </recordingStmt>
            </sourceDesc>

[berndmoos]

The paths in the transcript file are irrelevant for ZuMult. It would still be cleaner to make them relative, though...