cpp11bigwig 0.3.1

• New bigbed_info() and bigwig_info() report header metadata without reading
  any intervals. bigbed_info() returns the field counts and embedded autoSql
  schema, making it possible to identify the BED variant a file holds before
  reading it (a genuine BED12 has defined_field_count == 12). bigwig_info()
  returns the version, zoom levels, chromosome count, and file-level summary
  statistics (min/max/mean/std).

• read_bigbed() now returns all BED columns for files with no embedded autoSql
  schema (e.g. a bed12 written by bedToBigBed without -as). Previously such
  files returned only chrom/start/end; the reader now falls back to the
  field counts in the file header and names columns with the standard BED field
  names (any extra bedN+ fields become generic fieldN character columns)
  (#18). When a file has no embedded schema, read_bigbed() now emits a
  message() noting that the column names were inferred rather than declared
  by the file; silence it with suppressMessages().