Declaring math versions

<#310#>decl<#310#> | | <#311#>version-name<#311#> Defines <#313#>version-name<#313#> to be a math version. The newly declared version is Initialized with the defaults for all symbol fonts and math alphabets declared so far (see the commands | | and | |). If used on an already existing version, an information message is written to the transcript file and all previous | | or | | declarations for this version are overwritten by the math alphabet and symbol font defaults, i.e.~one ends up with a virgin math version. Example: <#314#>tex2html_preform<#314#>verbatim47#