- changed return value of V86.wait_until_vga_screen_contains() to boolean with true:success and false:timeout
- removed "throw" and "finally" statements in V86.wait_until_vga_screen_contains()
- removed "finally" statements in exec_test() to simplify cleanup code
- removed "export" statements (forgotten leftovers from a silly experiment)
- simplified parsing of options.timeout_msec in V86.wait_until_vga_screen_contains()
- changed line-matching function to string.startsWith()
- switched from Element.innerHTML to Element.textContent in html assignments
- relaxed rules for handling of command in expected[] in expect()
- removed unused argument "fdc" from FloppyDrive constructor
- renamed variable "tm_end" to "end"
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