As used in sections 8-160 to 8-162, inclusive, “capital improvement program” means a priority schedule of any and all necessary municipal capital improvements projected for a period of not less than six years and so prepared as to show the general description, location and estimated cost of each individual capital improvement and including the proposed method of financing; “capital improvement” means a major improvement or betterment of a nonrecurring nature to the physical plant of the municipality as differentiated from ordinary repairs or maintenance of a recurring nature, and “municipality” shall include a city, town or borough.