Europe PMC abstract text and PMC-source lookup fixes
- Markup strip no longer eats statistical notation (e.g. P<0.001) between a stray
<and the next real tag (#94) - pubmed_europepmc_fetch resolves source: "PMC" refs for articles also indexed in PubMed, instead of matching nothing (#94)
- notFound notice points a PMCID-shaped miss at pubmed_fetch_fulltext; doi fields across the tool catalog disclose that casing differs by upstream (#94)