tree export/import cannot handle node-comment which are no bootstraps

[westram]

Problem:

To create such comments call

• Tree/Compare topology.. in NTREE

That will generate node-comments like # 1 and # 26.

Exporting such a leads to various names for inner nodes, e.g.

• groupname
• '# comment:groupname'
• '# comment'

When loading such a treefile, arb imports each of them as group.

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Solution:

• strictly define information at inner -nodes (in newick):

  <nodeinfo> ::= <label>[':'<length>]
  <length>   ::= length specified as <number> 
  <label>    ::= [':']<group> |
                 <bootstrap>  |
                 <custom>':'  |
                 <remark>':'<group>
  <group>    ::= name of group. May not match <bootstrap>!
  <remark>   ::= <bootstrap> | <custom>
  

  • if <label> contains a :, the whole label has to be quoted.
• strictly define interpretation of <remark>s:
  • <bootstrap> ::= anything that matches <number>['%'] is interpreted as support value.
    where <number> is a floating point as accepted by strtod.
  • <custom> ::= anything else is handled as custom remark.
  • may contain any character, but ':' or single quotes.

• exporter: save strict format
• importer: expect + read strict format

See also ​https://phylipweb.github.io/phylip/newick_doc.html

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Other requirements:

Provide separate, independent toggles to save

• bootstrap values and/or
• custom remarks

from GUI and CLI.

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Related to #767, #838, #845