New stemmatic datasets and metadata for Ancient Egypt

[Adonis-Dulaurent]

This pull request adds new stemmatic data for several ancient Egyptian texts, including both metadata and stemma graph files. The main changes involve the addition of detailed metadata (such as publication information, authors, and witness descriptions) and the corresponding stemma diagrams for each work.

New stemmatic datasets and metadata:

Addition of new works and their metadata:

• Added metadata.txt files with comprehensive bibliographic and textual information for the following works:
  • "Das Stemma des Amduat" (Jurgens, 1999) (data/egy/Jurgens_1999_Amduat/metadata.txt)
  • "Ein Textzwilling zu M2NY im Stemma des CT-Spruchs 225" (Jurgens, 2001) (data/egy/Jurgens_2001_CTSpell225/metadata.txt)
  • "Das überlieferungsgeschichtliche Verhältnis von Unas und Sesostrisanch am Beispiel von PT 302-312" (Kahl, 1995) (data/egy/Kahl_1995_PT302-312/metadata.txt)
  • "Approche d’un texte a plusieurs variantes" (Patane, 1985) (data/egy/Patane_1985_HymneAOsiris/metadata.txt)

Addition of stemma graph files:

• Added corresponding stemma.gv files depicting the stemmatic relationships for each of the above works:
  • data/egy/Jurgens_1999_Amduat/stemma.gv
  • data/egy/Jurgens_2001_CTSpell225/stemma.gv
  • data/egy/Kahl_1995_PT302-312/stemma.gv
  • data/egy/Patane_1985_HymneAOsiris/stemma.gv

These additions expand the dataset with new texts and their stemmatic analyses, providing both textual metadata and graphical representations of manuscript relationships.

[Jean-Baptiste-Camps]

So many thanks, @Adonis-Dulaurent , for this PR ! This is very clean and precise work. We'll review it soon !

[Jean-Baptiste-Camps]

I have finished my verifications and checks. This is an enthusiasming PR, with such a broad chronological range !

I have especially:

• used grey for uncertainty (dashes are for contamination), in accordance to OpenStemmata Guidelines;
• added links and other informations when available.

The last stemma in the PR is a bit surprising. Maybe it will be interesting to check the source at some point. Also, I wonder if one could add in the future more witnesses and date informations, maybe based on the reigns of the Pharaohs or the archeological information.

@ugodreau , I'll let you have a look too !

[ugodreau]

I did some checks and minor corrections. I also added witness metadata for the stemma of the Hymn to Osiris, obtained from a more recent publication. The stemma in this publication (below) does not display the aforementioned oddities of the one by Patanè. I think it should ultimately be added to the database as well.