Officiallly in DICOM, ISO 2022 character escape may ONLY be used if the the specific
character set (0008,0005) lists both the initial character set in its 2022 form (e.g.
"ISO 2022 IR 100" in place of "ISO_IR 100" and also contains a list of all character sets that
could be used. In practice however, some modality equipment suppliers don't bother to include
0008,0005 in their data at all, or fail to use the 2022-specific variant.
This property, if true (the default value) allows DicomObjects to check whether a string contains
any escape (0x1B) characters, and if it does, to assume 2022 mode (thereby enabling chages of
character set) even in the absence of a marker in (0008,0005).