Four years ago, Eels founder Mark Oliver Everett decided to take a break from music. He went on what he calls a project of self-improvement, during which he got married, got divorced and, at the age of 54, had a son. He also spent time reckoning with the losses he’d experienced earlier in life, including his sister’s suicide, his mother’s death from cancer and his father’s fatal heart attack. Now he’s back, with a new album, ‘The Deconstruction,’ a reflection on both the pain and joy of life.